Spade head



FIG. 1 is a front view of the spade head;

FIG. 2 is a back view of the spade head; and,

FIG. 3 is a side view of the spade head.

The broken line showing of shovel is included for the purpose of illustrating portions of the article and forms no part of the claimed design. 

The ornamental design for a spade head, as shown and described. 